<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1" />
<link rel="stylesheet" href="resources/simple-snap.css">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../../resources/gesture-util.js"></script>

<div id='scroller'>
  <div id="space"></div>
  <div class="snap left top" id="top-left"></div>
  <div class="snap right top" id="top-right"></div>
  <div class="snap left bottom" id="bottom-left"></div>
</div>

<script>
var scroller = document.getElementById("scroller");
var topLeft = document.getElementById("top-left");
var topRight = document.getElementById("top-right");

function scrollLeft() {
  return scroller.scrollLeft;
}

function scrollTop() {
  return scroller.scrollTop;
}

function keyPress(key) {
  return new Promise((resolve, reject) => {
    if (window.eventSender) {
      eventSender.keyDown(key);
      resolve();
    }
    else {
      reject('This test requires window.eventSender');
    }
  })
}

promise_test (async () => {
  await mouseClickOn(10, 10);
  scroller.scrollTo(0, 0);
  await keyPress("ArrowDown");
  await waitForScrollEnd(scroller, scrollTop, 400);
}, "Snaps to bottom-left after pressing ArrowDown");

promise_test (async () => {
  await mouseClickOn(10, 10);
  scroller.scrollTo(0, 400);
  await keyPress("ArrowUp");
  await waitForScrollEnd(scroller, scrollTop, 0);
}, "Snaps to top-left after pressing ArrowUp");

promise_test (async () => {
  await mouseClickOn(10, 10);
  scroller.scrollTo(0, 0);
  await keyPress("ArrowRight");
  await waitForScrollEnd(scroller, scrollLeft, 400);
}, "Snaps to top-right after pressing ArrowRight");

promise_test (async () => {
  await mouseClickOn(10, 10);
  scroller.scrollTo(400, 0);
  await keyPress("ArrowLeft");
  await waitForScrollEnd(scroller, scrollLeft, 0);
}, "Snaps to top-left after pressing ArrowLeft");
</script>

